Pierre & Irénée du Pont — Nylon, DuPont & the Conspiracy Question

The chemical dynasty that industrialized nylon. Herer's conspiracy placed DuPont at the center of hemp suppression. The institutional proximity is real. The conspiracy is harder to prove.

The du Pont family name appears in nearly every account of the Herer conspiracy thesis — the claim that hemp was suppressed by a coordinated effort among DuPont, Hearst, and the Mellons to protect synthetic-fiber and timber interests. The du Ponts' role in that narrative centers on nylon, the synthetic fiber invented in their laboratories in the 1930s. Whether they actively conspired to suppress hemp is a different question.

Pierre S. du Pont (1870–1954)

Pierre Samuel du Pont served as president of DuPont from 1915 to 1940 and as president of General Motors from 1920 to 1923. Under his leadership, DuPont transformed from an explosives manufacturer into one of the world's largest chemical companies. Pierre du Pont was also a significant figure in the movement to repeal Prohibition — he served as chairman of the Association Against the Prohibition Amendment, arguing that alcohol taxes would reduce the need for income taxes.

Pierre's role in the anti-Prohibition movement connects to the Herer thesis through a chain of institutional relationships. When Prohibition ended in 1933, the federal enforcement apparatus needed a new target — and DuPont, as a major chemical company with potential competition from natural fibers, had institutional interests that aligned with marijuana prohibition. Whether that alignment was coordinated or coincidental is the central question.

Irénée du Pont (1876–1963)

Irénée du Pont served as president of DuPont from 1919 to 1926 and oversaw the company's pivot from explosives to industrial chemistry. Under his leadership, DuPont expanded into synthetic materials — the product line that would eventually include nylon and the synthetic fibers central to the Herer thesis.

Nylon and the hemp question

1935

Wallace Carothers invents nylon

Chemist Wallace Carothers, working in DuPont's research laboratories, develops nylon — the first commercially successful synthetic fiber. The polymer is patented in the late 1930s and brought to market in 1939.

Herer's conspiracy thesis argues that DuPont needed hemp suppressed to protect nylon's market position — and that the Mellon family connection between DuPont, Treasury Secretary Andrew Mellon, and FBN Commissioner Anslinger provided the mechanism for arranging prohibition.

Common claimDuPont conspired with Anslinger and Mellon to suppress hemp to protect nylon sales.

What the evidence showsThe institutional proximity is real: the Mellon family had financial ties to both DuPont and the Treasury Department that housed the FBN. But nylon's first commercial application was women's stockings, not rope or industrial fiber that would compete with hemp. DuPont did not produce hemp products. No corporate records documenting a coordinated anti-hemp strategy have been found. — DuPont corporate history; Hounshell & Smith, Science and Corporate Strategy (1988)

What the evidence supports

The historical reading that best fits the available evidence is that institutional interests aligned without necessarily coordinating. DuPont had economic interests in synthetic materials. The Mellon family had financial interests in DuPont. Andrew Mellon appointed Anslinger to head the FBN. Anslinger needed a new mission after Prohibition ended. These facts describe a constellation of institutional incentives, not necessarily a conspiracy.

The distinction matters. A conspiracy requires coordination — meetings, memos, explicit agreements. Institutional alignment requires only shared interests and overlapping social networks. The du Pont family operated in the same financial and political circles as the Mellons and the senior levels of the Treasury Department. They did not need to conspire against hemp for their institutional interests to be served by its prohibition.

The timeline problem

The Herer thesis also faces a chronological challenge. Nylon was not commercially available until 1939 — two years after the Marihuana Tax Act. If DuPont arranged the Tax Act to protect nylon, it would have required acting before the product existed in commercial form. This does not disprove the thesis (corporate planning horizons can be long), but it weakens the claim of an immediate economic motive.

Assessment

The du Ponts are central figures in the Herer narrative, and the institutional connections Herer identified are real. DuPont was one of the most powerful chemical companies in the world. The Mellon connection to Anslinger is documented. The economic logic of synthetic fiber interests being served by hemp suppression is coherent. What is missing is the evidence of coordination — the memo, the meeting minutes, the corporate directive. In the absence of that evidence, the du Pont conspiracy remains plausible but unproven, like much of the Herer thesis.